﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication05
{
    class Polygon
    {
        protected int width, height;
        public void setValues(int a, int b)
        {
            width = a;
            height = b;
        }
    }
    class Rectangle : Polygon
    {
        public int area()
        {
            return (width * height);
        }
        class Triangle : Polygon
        {
            public int area()
            {
                return (width * height / 2);
            }
        }
        class Program
        {
            static void Main(string[] args)
            {
                Rectangle rect = new Rectangle();
                Triangle trgl = new Triangle();
                rect.setValues(4, 5);
                trgl.setValues(4, 5);
                Console.WriteLine("recta:{0}", rect.area());
                Console.WriteLine("trglb:{0}", trgl.area());
                return;
            }
        }
    }
    }
 

